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Waveguide integrated superconducting single-photon detectors implemented as near-perfect absorbers of coherent radiation

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  • Mohsen K. Akhlaghi

    (University of British Columbia)

  • Ellen Schelew

    (University of British Columbia)

  • Jeff F. Young

    (University of British Columbia)

Abstract

At the core of an ideal single-photon detector is an active material that absorbs and converts every incident photon to a discriminable signal. A large active material favours efficient absorption, but often at the expense of conversion efficiency, noise, speed and timing accuracy. In this work, short (8.5 μm long) and narrow (8 × 35 nm2) U-shaped NbTiN nanowires atop silicon-on-insulator waveguides are embedded in asymmetric nanobeam cavities that render them as near-perfect absorbers despite their small volume. At 2.05 K, when biased at 0.9 of the critical current, the resulting superconducting single-photon detectors achieve a near-unity on-chip quantum efficiency for ∼1,545 nm photons, an intrinsic dark count rate

Suggested Citation

  • Mohsen K. Akhlaghi & Ellen Schelew & Jeff F. Young, 2015. "Waveguide integrated superconducting single-photon detectors implemented as near-perfect absorbers of coherent radiation," Nature Communications, Nature, vol. 6(1), pages 1-8, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9233
    DOI: 10.1038/ncomms9233
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    Cited by:

    1. Andreas Gritsch & Alexander Ulanowski & Jakob Pforr & Andreas Reiserer, 2025. "Optical single-shot readout of spin qubits in silicon," Nature Communications, Nature, vol. 16(1), pages 1-7, December.

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